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"The element titanium has a high degree of chemical activity at room temperature when in a finely divided condition. In the massive state this activity is only exhibited at high temperatures. The powdered metal is highly pyrophoric. Titanium forms quite stable sulphides and carbides, although these are subject to oxidation at high temperatures. It also form nitrides. Titanium being a transitional element forms hydrides with hydrogen which are stable at ordinary temperatures, but which dissociate at red heat liberating the hydrogen and leaving the metallic titanium in a very active state. Alloys are formed with such metals as aluminum, manganese, iron, cobalt, nickel, copper, zinc, tin and gallium. F. S. Wartman states that titanium in alloying with the other elements tends to form intermetallic compounds that are insoluble in the solid state or if solid solutions are formed the tendency is toward those which are stable only in the liquid state. Such conditions favor the formation of brittle alloys of little structural value"--Introduction, page 1-2.